109172973 has 32 divisors (see below), whose sum is σ = 186955776. Its totient is φ = 55078848.

The previous prime is 109172969. The next prime is 109172989. The reversal of 109172973 is 379271901.

It is not a de Polignac number, because 109172973 - 2² = 109172969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109172953) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2415 + ... + 14972.

It is an arithmetic number, because the mean of its divisors is an integer number (5842368).

Almost surely, 2^109172973 is an apocalyptic number.

109172973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

109172973 is a deficient number, since it is larger than the sum of its proper divisors (77782803).

109172973 is a wasteful number, since it uses less digits than its factorization.

109172973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17433.

The product of its (nonzero) digits is 23814, while the sum is 39.

The square root of 109172973 is about 10448.5871293683. The cubic root of 109172973 is about 477.9381656445.

The spelling of 109172973 in words is "one hundred nine million, one hundred seventy-two thousand, nine hundred seventy-three".